Một sóng vô tuyến có tần số  ${10}^8\text{ Hz}$ được truyền trong không trung với tốc độ  ${3.10}^8\text{ m}/\text{s}$. Bước sóng của sóng đó là

Dầu mỏ và khí tự nhiên của Hoa Kì phân bố nhiều ở khu vực nào?

Các phát biểu dưới đây là đúng hay sai khi nói về chức năng của protein?

Nhà thơ nào là bạn thân của tác giả Đỗ Phủ?

Lực ma sát trượt không phụ thuộc vào yếu tố

Thủy phân tristearin ((C₁₇H₃₅COO)₃C₃H₅) trong dung dịch NaOH, thu được muối có công thức là

VÀO MẶT TRẬN LÚC MÙA VE ĐANG KÊU

Vào mặt trận lúc mùa ve đang kêu

Dẫu hòn bi lăn hết vòng tuổi nhỏ

Trong những ba lô kia ai dám bảo là không có

Một hai ba giọng hát chú ve kim?

Vào mặt trận lúc giọng ve đang lên

Hay tiếng gọi - lên đỉnh cao đánh giặc

Đây mùa hạ lòng tôi sung sướng nhất

Bao điểm chốt anh hùng, tôi nổ súng cùng ai.

Vào mặt trận lúc giọng ve rất dài

Như sông suối, như đoàn quân vô tận

Da diết tiếng ve ngân chẳng tắt

Tiếng ve bay theo chân bước trùng trùng.

Vào mặt trận lúc giọng ve đang rung

Chúng tôi sống tháng năm xao động lắm

Truy kích địch có rất nhiều đêm trắng

Nhiều đêm trong, tâm hồn cùng thức bên nhau.

Ra mặt trận lúc giọng ve kêu mau

Là khẩu lệnh khẩn trương vào trận cuối

Những báng súng trong tay đều nóng hổi

Những tim người đập theo tiếng ve kêu...

Mùa khô ơi mùa khô thân yêu

Dẫu hòn bi lăn hết vòng tuổi nhỏ

Nhưng trong những ba lô kia, ai bảo là không có

Một hai ba giọng hát chú ve kim?

(Hoàng Nhuận Cầm, in trong Xúc xắc mùa thu, Hò hẹn mãi cuối cùng em cũng đến, NXB Hội Nhà văn, 2015,  tr. 171-173)

Cụm từ nào dưới đây được lặp lại nhiều nhất trong bài thơ?

Đánh giá công nghệ có vai trò nào sau đây trong lựa chọn thiết bị?

Nghề nghiệp của những người thực hiện công việc xây dựng các bản vẽ, tính toán, mô phỏng, ... các sản phẩm máy móc, thiết bị thuộc lĩnh vực cơ khí động lực là?

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 26 to 30.

We all had the experience of trying to learn something new only to find out that we're not very good at it. We look around at (26) _______ people we are learning with, those seemingly more gifted than us. It seems to come naturally to them.

Undoubtedly, there are people (27) _______ are brilliant at certain things. (28) _______ , many of them are not really born with talents. Psychologist K. Andrers Ericsson studied students at Berlin's Academy of Music. He found that while all the participants in the study had all the (29) _______ of world famous musicians, only some of them actually reached international stardom. What made the difference? The answer is simple: practice. The people that became (30) _______ were more competitive and practised about 2,000 hours more than others. It turns out that practice really does make perfect.

(Adapted from Empower)

The answer of question 29:

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the best answer to each of the following questions from 31 to 40.

Working on Your Workout

(I) Although appreciating a balanced diet and regular exercise, most people do not know how to exercise properly. Consequently, they usually rush through their workouts, or they make the same common workout mistakes. (II) Exercising the right way is important for people who are worried about their health and their appearance. (III) However, if someone is not working out properly, they will not see the results they want. Therefore, training experts have devised tips to teach people how to exercise correctly in order to achieve the greatest health benefits. (VI)

One of the most common workout mistakes is doing the same routine over and over again. This does not challenge your muscles, and it can actually prevent muscles from growing and repairing themselves. Instead of always sticking to the same old workout, it is important to change your routine every six to eight weeks. It is also important to add a variety of workouts to your routine, such as swimming, yoga, or biking, to make sure your whole body stays fit. This will help make your workouts more interesting, and benefit your health and muscle development as well.

Another mistake people tend to make is to work out too hard, too often. Your body needs to rest between workouts; otherwise, no progress will be made. It is best to keep the number of hard workout routines to no more than two per week. Then, for those who don’t want to get off schedule by skipping a day, shorter workouts of about twenty minutes can be used on other days. For more variety in workouts, you could also plan an easier routine for forty to sixty minutes between days of shorter, more intense workouts. Experts recommend, however, taking at least one day off completely each week, especially after several hard workout days in a row.

In reality, no one is perfect. However, if you want to make a difference in your overall health, there are some things you can do. Stretch before and after every workout. Do not rush your routine, and do not work out too little or too much. Remember not to make these common workout mistakes, and always have fun while exercising!

According to the passage, which of the following statements is TRUE?

Trong thời gian ở Quảng Châu (Trung Quốc) từ năm 1924 đến năm 1927, Nguyễn Ái Quốc có hoạt động nào sau đây nhằm chuẩn bị cho bước chuyển biến về chất của phong trào giải  phóng dân tộc Việt Nam? 

Read the passage carefully. Choose an option (A, B, C or D) that best answers each question from 16 to 22.

1. Like many emergency responders, Nicholas Groom is used to stress at work.  On the one hand, the stress can be helpful. “I find that when attending a serious incident, it helps me to maintain focus on the situation,” Nicholas Groom said. On the other hand, the work can be highly pressurized. “Too much stress can impair your ability to make decisions,” he adds. And Groom is not alone in his complicated relationship with stress.

2. Many people believe that there should be a balanced amount of stress. In other words, not too much stress so you’re not overwhelmed but not too little stress so you don’t feel unmotivated. After all, some anxiety is motivating; think of the adrenaline before a deadline or the excitement before a competition.  Sports fans sometimes even talk about a “gene” in some athletes who seem to play best in the decisive final moments of a match. Furthermore, many psychologists claim that performance in many situations increases with stress up to a point. Of course, any stress can cause harm when it’s prolonged. To take just one example, a long-term high heart rate is linked to cardiovascular diseases. And additional stressors, such as financial pressures or psychiatric issues, clearly affect how beneficially someone can respond to stress.  

3. So is there a way to harness stress to your advantage while being mindful of its detrimental long-term effects? One key factor is to avoid, whenever possible, the point when stress leads to mental and physical collapse. Crystal Wernicke, 30, has always used stress as a motivator. But juggling between parenting, a full-time job, a voluntary role and financial troubles at the same time became too much and eventually led to a two-month period of illness. Another factor is the presence of control. For those who feel powerless over their situation, stress is unlikely to be beneficial. But with some autonomy over stressful tasks, we are better able to convert that pressure into higher performance.

4. When it comes to stress and how it affects your performance, it’s helpful to recognize the variations in personality, type of stress and task that affect the level of pressure you are under, as well as understanding tools you can use to control and harness that stress. Ultimately, it’s not helpful to take a one-sided view, either demonizing or glorifying stress. As James C Quick, a management professor at the University of Texas, sums up: “Stress can be the kiss of death as well as the spice of life.”

Which of the following can be inferred from the last paragraph?

Để tăng thời gian hiển thị cho các khung hình ảnh rõ nhất trong ảnh động, ta thực hiện thao tác nào?